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How to install SSL in Plesk Panel ?
How to install Free Let’s Encrypt SSL in Plesk Panel ?
Step 1. Login to Plesk Panel Navigate to Domain and Select the domain name.

Step 2. Under the Security section choose SSL/TLS Certificates

Step 3. Choose Install a free basic certificate provided by Let’s Encrypt

Step 4. Select the check box Secure the wildcard domain (including www and webmail) and click Get it free.

NOTE: You can only install wildcard SSL when your domain nameservers are completely resolving to HostingHome Web Server.